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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f7625e4861c966af720f55eab78bf4ee0ed57f7e03e392d78806069f254097' 
  AND token = 'xmf4Q5zWaRR2cP0mbDYDjhejyFsPDsGS5qgEmhOE/JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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