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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff613c7e5351e0d9724d1a19036bfdec57154b0f9749956bd6bfaf52bca4e66' 
  AND token = 'gWA9Ysp7gA6/GuNR8Yha0wPcqXBahQI5if5aDX4ZJNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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