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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa4c0dcb80a407ea940facee39f1d8ddbd092c4823a258bc0f182ac5d26cf3a' 
  AND token = '8i0tt5y4/b/RU8FlessiLPEi1se++ZrSUI19JHQz0TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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