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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803ad0e1824f191936d854863b6ceda09d12f65380676de29f213e61ac7452e4' 
  AND token = 'WgLQReLt4BbcR1B8qe8WxMrhoCgaN0Qm1PpKXnTod3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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