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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40640b4cafa30f1cc6e520561700385276372b6a9b3cba4f00c4e135dd20ce50' 
  AND token = 'eQF2J55fDXc709hf0ywQRV1mI66LFNrOv5x6DdtwClQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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