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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48273e95ec7ea7d6bfa89c8304c731b3a3f677a171c9663b826c5696ae4ce5ce' 
  AND token = '/50Xjfe2GaiIVcSa7NL9CZewaee8tKarKog2N5y0AjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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