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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307c481b6e97b357db007b2b049bd8734d1f471399c84f27bb56f1c72c891222' 
  AND token = '474c58ZAecwhQM0eiRI+dPBpGSHZTveJh/+UeEWcYlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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