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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb522dcdd8ffa27c69b8e092f045ae070548fedee77e98b42cc54546b032aa3c' 
  AND token = 'YdOBzUv+aelQ4nRWnplJ/xcFx8gkZyopxdSMkSvUaQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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