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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa37720e477d9f7dd144b9457c5a9ca6ae8637582bc06b65c389f62af8357a85' 
  AND token = '+60Bi7PNp1IXTTBlhfMDykzEaNbZeSzi33DAr7EBQ0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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