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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ced80d4e89d0702ebed01c343919915885bae11da0eb29870812251a8250d9' 
  AND token = 'iVQ0WTl8m50UrfaS0xVH3IfdAo7b+VqG8qQT6pVTlj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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