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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07493da768c0295e855b4cfa37c3f6bde574b9dea1de35f283a35004933b52b' 
  AND token = 'JsctvqArOCNcG0Ec1PxV3FPApYGt3RCaY+UKEDbUJa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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