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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a08e9a03263b2e917b6ac2a0ea32b1ba2f5a0314bfbed4d6565e3a920089e3' 
  AND token = 'RTxZnARF0UEXYFvhqW6Qq4smReCZAFigETU8+7AocqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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