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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570146a5bf018e9288024c302e0a40a5bb5416125657198aa56250faf1853597' 
  AND token = 'MdnADAvmcUHLymY6ULpC71VUUko75ZCrx9EwR9CyVrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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