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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d83cd45eb4d75191baa370ac7006a0f4a1be799f4dea810029623b666fb0ef8' 
  AND token = 'rJNeUvFCxu9O9ldzPZzELRz2/1pba+kOljujp6YqESw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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