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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658fcac630e510e377299c87782a33c7f1fce1f1b4dee9d22212e5cd1b93a1b5' 
  AND token = 'bMAQTS7ZYuGgtHiULV0meHOU8KfdMj6mUjx0QchRdro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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