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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9aac17996f81e7ccf3191a85390f893e83f0c45b9de56af5d8e2d59c8202fb5' 
  AND token = '5ctIncLprgxLuYKDs6HjfK/iBx8uNMYjmpytWR3wfhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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