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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b483b7acd6bd38c812b2d4f0a6108ff9879244d548b655d33428b67f298977c' 
  AND token = 'bf6l1YCtCf9EyjaAaGGYGeLSkuq+xR2C8b+KT2yJyJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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