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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8d85e0f9ac71982b42b66e3091afb90f39c858ef1a6f9ebb8d1d11a49daaad' 
  AND token = '92r8Ty442nwcEiTuBtA1IBD7MX37FiuDZC+0Xgelo5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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