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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46bfbb03194f07880c64849a594a848a959ef9f0bc4fcb4b13a853a3e8093a9b' 
  AND token = 'auzi74xHEF3jPbjCQP6GDKGPkVJ8o6Nw1x58u9wehQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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