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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a430ccb2de90f7876a16c1947d0f54a5a95a3ff2d61e494324dfc61c1c9fca' 
  AND token = 'iZ+S+wAD5B7y6TYiR+iETcnxxKpJTQAnv5evhZHB/qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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