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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737c871c9470fc54d2fa1b259755fb27ed526e6479871ced708a858aebb6ce28' 
  AND token = 'iB3UVOg7/CmJLAR+c19nyF9W31BEHzIWN6vvQ60kLas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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