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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4cd58114aecca7734446303cdc04e9ce13b9d0348df162d642a0ed1804146a' 
  AND token = 'tM6M9mWiYkLD1/mdx8JITfjjlnBqt5aqZ9BjNH24l+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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