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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cf7cb4f7791db3c5d216aa4283b7e07f6872acf706fbf533ac504c4f386461' 
  AND token = '+QmJuITiRK/2bdlpt6cHylcU4Ozt/chZ/5+FiRKHh/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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