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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0270d20ae28dd04c5fb1d5d3beeae0f8ce4d6e6c14f09ba424d5ac5017b93d99' 
  AND token = 'BdBh4o2PnO8KF/EdCqJEuQ054hZGFgnjceniXRyYH/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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