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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ec0afcb14084c33abbd153e13af12191cc91392265829102fd9af6cbd76bb4' 
  AND token = '0+sabxpGmbm+Y6fZkv912iYk5q+DCDbz5cR0NFBbRVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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