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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aba91f51c8c21a9795d7b259ddf84e6e7fc900589cdc14566d5c0e5e5eebf7b' 
  AND token = '159y+DLbbu7SGh3zf+Vdkfi7596cMTzRY5Ej3rS2yBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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