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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bed47799be8805bd0550a54cfac0bddedddfc1bd1895b9730747d4c7f5645f' 
  AND token = 'sJn1eS2Kgx+QcKEmORzvn80Gg4KQ5wJIm6iYeT2Z/zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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