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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563e8215f72866114a424314029f33bd929dd5ce598d15f8ff9a6e64af711d6c' 
  AND token = 'azmaoK0nKJ3dSmJZQRtENjaIagRv5EYkA0X8rVF423k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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