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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc1b8ac3e02ab270367ba4d1fb4c2af5cbd34930d0cd379d2f10216e1fa32ff' 
  AND token = 'UlaY/KfxMv5FFwd8Il9RgCkEJoTfrFIJ8h3hP2awpN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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