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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c507515cc916716bec278cd0df7c9862b03498976c1558bd0cdd78b4f3f9ae' 
  AND token = 'RUHNXBtH5DVo1O7jEdg2mHx07Gdrp+R+kEk5SI/Bu2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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