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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d1bff000bd07248ed4b327f7edcb19b00b9bd04a015a66de42f00a2f7230a3' 
  AND token = 'XYbpQrI5om98J4cE8uHbj+Hh0OwV5TSzf2fd+hECiq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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