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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87a1d1d5f24a047673c6109eab94b2d57674cf74506019516d471015305603e' 
  AND token = '2Mn3T7a0QqZWbzDRPbVHTwxMV/pto6SgEfb2UiLTSyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}