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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4117bf77df8d0b67c038477aa4fba93efba3c3f35a260adf8d5cf6dd923c7f' 
  AND token = 'mpTb7NX+vnh+O0iFzv1wZ50bcWuBxEy8qsW+pHGdtxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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