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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca27947b1de02c88080e649dc7ac31eafd78ecf73bf404834a80761f4d64a67' 
  AND token = '7fq27mkAgHTKfk1sobUvzku6f57AChBBY7kfaoLgnLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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