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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7bf8bf156e7db7989623590d779c080b1024e47a8a6d35364997fe15cafe96' 
  AND token = '3NqnPhI35uIbfsqe9BKBL6IwAVi+eGmVVxinDwwavsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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