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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590d2f869e89b51e0fcd144cd712e1590ad66b18c334b3468ec81da599fe9ee9' 
  AND token = 'Xw3e05/i7gZ8+O/2X2TE9bXr+O4o6AJ1iKbkZhMPTsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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