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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b01b7f7e6fbf99f5c86fa53d4760d0c660ae6473df6688930b1b77646cf03ba' 
  AND token = 'CABsswcxg4EpndHE8LySWWNAMImAbaaoN+pqfymWzXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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