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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e2c0cdd81d85130d7d1fda3248558bd9df0ae65d7b1283fba7107ba9b5603a' 
  AND token = 'gPvrU1+zr771QtiGwz0tJx7e/95ftxDCRW+zNxNM4ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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