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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893f26f111f36d252d32479f327050da2d9ef37157f05f4c70e7892bfbb023e3' 
  AND token = 'gYbH/xim47kRLhdS7wtoVczVgbuurf0JGyb+00Ha83w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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