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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a70a98c20a3f3af5648edbe9d829f61aa5f122f251050255ea0a7ae19e7448e' 
  AND token = '4gwNVoAJqOh+qf8MTfO4i381BTos5/P2o5ZgwWCXA28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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