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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0925402071f66dfae6d56ffa4572e9139ea3bdfc0688c875c7bbcba946bd6cba' 
  AND token = '3F5eoe/hubSYcVd+UU+sYZ4P01/tq/6C2gIus99WIwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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