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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83fb1ccf57e81ac24dcc75bfb8a942414e1b11274c7d94be9a5ee704c39870d' 
  AND token = 'guhILmaI9pz5bNwBFZsg/LxAyWmT0gK/1dPuETPs9EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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