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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac390edbe259a7d498e1202e946e0096bef57abb193c7b52ed50ca1383958323' 
  AND token = 'k7UEgqZexD7YcXN0FqGUES9CB89HXk4F3TLSHBnPeN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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