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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6522be3c77bd95b9e6198bb0644dbdee60f75a813854218988c21948d6d0968' 
  AND token = 'yMvfi8TWfNo6ouuOQmF9iMxe51GOLgmojQejX/WXYgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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