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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6a8109ba987730bef61499d42c8e4c15307bceba89e00baaafcc8123614c85' 
  AND token = 'Rws/ne28gG1S6b3K8KEgxc4x2lOagyCd4NA/YRqJ1Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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