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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83049717f5e6d54893c6bb60c70487e0fe8b5606d1856a7ccf1576f97984a3ad' 
  AND token = 'NwBeDU1gc8ORJhIfPIC5twnEW7SU0Zg58FubcEanGJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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