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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14a79731b117941988138193d0ac455ba8e193d2d06ca62810245b80d802cf0' 
  AND token = 'Xl5lF+Wr5/F0rNrO8pcjx2Oonhod0TzKswGpO3xZJGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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