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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db950f179651ba2478cb73ec7014818c4fe6703848fe64ba86963ac808473e3d' 
  AND token = 'nGM3/VzIPNh73f8CBbE4JGMzv23/BjEfBEg2x2GJFzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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