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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605665697bcce470c79335177a8c0057c701273ae87846de2fe2e64c1dbff40c' 
  AND token = 'HhFPY+amqSew4xxq0SoTQPs+2Vhm1J+oNp4wAQ/eeTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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