SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8178220360b3e0d841f2f5767db8f44b5a2596698802ea7a7a6dce5ba5f82113' 
  AND token = 'ScLGLUbJdYxBpvYXv6R+s6WN/UzNsI5uV3JrLfcO9UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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