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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f85af268c961c295b332738b1d43b2283650e7502e9d4ec6cc569b33dfbde9' 
  AND token = 'w9RYNJ0wWwK9bb2SbFzKtvtzIMoIfE8AwaOM2kdH9vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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