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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96adad9bf10daf4379ac7e30d67f44be89db2c7dd304e2c6689cd999e3788756' 
  AND token = 'ldprQp3HMaO6AxPJayY1hwRjBNbijj0Xo2M+oGkoIms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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