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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f873ca1155c101dce0980a1c0a20cb4c00eec9c70bbca3aa3c260d162def90d4' 
  AND token = 'uKyEtYwGsc7WssDxyGIhzFbY/Ljz2+I+CW0XT4hfmmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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