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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d42ff564d52b69a23e71bdae367141e9fea691a244da5f107ba278840afb981' 
  AND token = 'S//Ei6eiUWIsoy5f7ST2nyXqbBZk8Z1IW4MabsaUi/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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