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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e435b90d5ea7b32d7b9e14fac6c15368eb4ae012c806ab9e0e6f0c760ae119' 
  AND token = 'kmNkONsFYFQtGiFAO0xYcWdyuTq9sa8qDduiIEBDjWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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