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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364951ebc3ab57f8b3327165f4b0f5c0cc1b40dbfdb65ea69506eb5b76cc9d33' 
  AND token = 'Eo0somV9K/jFO6APmiIirLjIe7KE/ddCdbX1owJ4BkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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