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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d8b810b7945f2bb51d5f83b97cc35968a00ffd2f985f1e0ac84c0ae1e7ebb2' 
  AND token = 'i+2jmYt5zieg70ABeH30nUMIgcG2U0RNO3zHpWkJR7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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